Abstract
Research on NO in plants has achieved huge attention in recent years mainly due to its function in plant growth and development under biotic and abiotic stresses. In the present study, we investigated Cd induced NO generation and its relationship to ROS and antioxidant regulation in Brassica juncea. Cd accumulated rapidly in roots and caused oxidative stress as indicated by increased level of lipid peroxidation and H2O2 thus, inhibiting the overall plant growth. It significantly decreased the root length, leaf water content and photosynthetic pigments. A rapid induction in intracellular NO was observed at initial exposures and low concentrations of Cd. A 2.74-fold increase in intracellular NO was recorded in roots treated with 25 μM Cd than control. NO effects on Malondialdehyde (MDA) content and on antioxidant system was investigated by using sodium nitroprusside (SNP), a NO donor and a scavenger, [2-(4-carboxy-2-phenyl)-4,4,5,5-tetramethylinidazoline-1-oxyl-3-oxide] (cPTIO). Roots pretreated with 5 mM SNP for 6 h when exposed to 25 μM Cd for 24 h reduced the level of proline, non-protein thiols, SOD, APX and CAT in comparison to only Cd treatments. However, this effect was almost blocked by 100 μM cPTIO pretreatment to roots for 1 h. This ameliorating effect of NO was specific because cPTIO completely reversed the effect in the presence of Cd. Thus, the present study report that NO strongly counteracts Cd induced ROS mediated cytotoxicity in B. juncea by controlling antioxidant metabolism as the related studies are not well reported in this species.
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Abbreviations
- NPT:
-
Non-protein thiol
- SOD:
-
Superoxide dismutase
- APX:
-
Ascorbate peroxidase
- CAT:
-
Catalase
- GPX:
-
Glutathione peroxidase
- GR:
-
Glutathione reductase
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Acknowledgments
Special thanks are given to Professor Aditya Shastri, Vice chancellor, Banasthali University, Rajasthan, India for his kind cooperation. This work was supported by Council of Scientific and Industrial Research funding organization (CSIR) of India.
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Verma, K., Mehta, S.K. & Shekhawat, G.S. Nitric oxide (NO) counteracts cadmium induced cytotoxic processes mediated by reactive oxygen species (ROS) in Brassica juncea: cross-talk between ROS, NO and antioxidant responses. Biometals 26, 255–269 (2013). https://doi.org/10.1007/s10534-013-9608-4
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DOI: https://doi.org/10.1007/s10534-013-9608-4